1-800-962-2658 is Colt's toll free number. Follow the menu for the department you wish to reach. The Mustang has been out of production for a while. The one web site I knew of that had the manual is no longer up. You also might find it in one of these manuals: http://www.coltsmfg.com/cmci/manuals.asp
Made by Colt.
Try here:http://stevespages.com/pdf/colt_mkiv_series_80_380_auto_pistols.pdf ----
It is a .380 ACP caliber handgun produced by Colt Arms. It is a .380 ACP caliber handgun produced by Colt Arms.
Not recommended.
Single Action.
50-500 usd
check it out at: http://stevespages.com/page7b.htm
100-500 USD
Go to Colt's website and request a manual.
Contact Colt, get a copy of the owner's manual, follow instructions. Manual is free.
Contact Colt and ask for an owner's manual. Ask a gunsmith for help.
See if this works. Go to this sitehttp://stevespages.com/page7b.htm look for and click on Colt MKIV Series 80 380 . It will give you the manual